| | Site | Start date | Title |
|---|
| 05000382/LER-2024-004-01, Automatic Reactor Trip Due to Lightning Strike | Waterford | 14 August 2025 | Automatic Reactor Trip Due to Lightning Strike |
| 05000382/LER-2025-003, Auxiliary Component Cooling Water Train Inoperable Resulting in a Condition Prohibited by Technical Specifications | Waterford | 9 June 2025 | Auxiliary Component Cooling Water Train Inoperable Resulting in a Condition Prohibited by Technical Specifications |
| 05000382/LER-2025-002, Auxiliary Pressurizer Spray Train Inoperable Resulting in a Condition Prohibited by Technical Specifications | Waterford | 29 May 2025 | Auxiliary Pressurizer Spray Train Inoperable Resulting in a Condition Prohibited by Technical Specifications |
| 05000382/LER-2025-001, Inoperability of Startup Transformer a Results in a Condition Prohibited by Technical Specifications | Waterford | 23 May 2025 | Inoperability of Startup Transformer a Results in a Condition Prohibited by Technical Specifications |
| 05000382/LER-2024-001-01, Manual Reactor Trip Due to Engineered Safety Features Actuation System Relay Failure | Waterford | 7 November 2024 | Manual Reactor Trip Due to Engineered Safety Features Actuation System Relay Failure |
| 05000382/LER-2024-004, Automatic Reactor Trip Due to Lightning Strike | Waterford | 15 August 2024 | Automatic Reactor Trip Due to Lightning Strike |
| 05000382/LER-2024-003, Automatic EFAS Actuation During Surveillance Test | Waterford | 10 July 2024 | Automatic EFAS Actuation During Surveillance Test |
| 05000382/LER-2024-002, Automatic Reactor Trip Due to Transformer Failure | Waterford | 16 May 2024 | Automatic Reactor Trip Due to Transformer Failure |
| 05000382/LER-2024-001, Manual Reactor Trip Due to Engineered Safety Features Actuation System Relay Failure | Waterford | 15 May 2024 | Manual Reactor Trip Due to Engineered Safety Features Actuation System Relay Failure |
| 05000382/LER-2023-004, Non-Compliance with Technical Specifications Due to Performing Startup Channel 1 Functional Testing During Fuel Movement | Waterford | 14 February 2024 | Non-Compliance with Technical Specifications Due to Performing Startup Channel 1 Functional Testing During Fuel Movement |
| 05000382/LER-2023-003, Steam Generator Tube Degradation Indicated by Failed In-Situ Pressure Testing | Waterford | 30 December 2023 | Steam Generator Tube Degradation Indicated by Failed In-Situ Pressure Testing |
| 05000382/LER-2023-002, Plant Shutdown Required by Technical Specifications for Unidentified Reactor Coolant System Leakage in Containment | Waterford | 9 May 2023 | Plant Shutdown Required by Technical Specifications for Unidentified Reactor Coolant System Leakage in Containment |
| 05000382/LER-2023-001, Non-Compliance with Technical Specifications Due to pico-ammeter Circuit Board Fluctuations in Containment High Range Radiation Monitor B | Waterford | 1 May 2023 | Non-Compliance with Technical Specifications Due to pico-ammeter Circuit Board Fluctuations in Containment High Range Radiation Monitor B |
| 05000382/LER-2022-001-02, Non-Compliance with Technical Specifications Due to Incorrect Procedural Guidance for Radiation Monitors | Waterford | 22 February 2023 | Non-Compliance with Technical Specifications Due to Incorrect Procedural Guidance for Radiation Monitors |
| 05000382/LER-2022-001-01, On Non-Compliance with Technical Specifications Due to Incorrect Procedural Guidance for Radiation Monitors | Waterford | 3 January 2023 | On Non-Compliance with Technical Specifications Due to Incorrect Procedural Guidance for Radiation Monitors |
| 05000382/LER-2022-006, Non-Compliance with Technical Specifications Due to Incorrect Conversion Factors in Plant Stack and Fuel Handling Building Radiation Monitors | Waterford | 7 November 2022 | Non-Compliance with Technical Specifications Due to Incorrect Conversion Factors in Plant Stack and Fuel Handling Building Radiation Monitors |
| 05000382/LER-2022-005, Engineered Safety Features Actuation System Relay Failure Results in Reactor Trip and Emergency Feedwater Actuation | Waterford | 23 August 2022 | Engineered Safety Features Actuation System Relay Failure Results in Reactor Trip and Emergency Feedwater Actuation |
| 05000382/LER-2022-004, Regarding Operation Prohibited by Technical Specifications Due to Inadequate Radiation Monitor Calibration Procedures | Waterford | 23 June 2022 | Regarding Operation Prohibited by Technical Specifications Due to Inadequate Radiation Monitor Calibration Procedures |
| 05000382/LER-2022-003, Operation Prohibited by Technical Specifications Due to Radiation Monitor Calibration Error | Waterford | 13 June 2022 | Operation Prohibited by Technical Specifications Due to Radiation Monitor Calibration Error |
| 05000382/LER-2022-002, Operation Prohibited by Technical Specifications Due to Personnel Error | Waterford | 13 May 2022 | Operation Prohibited by Technical Specifications Due to Personnel Error |
| 05000382/LER-2022-001, Non-Compliance with Technical Specifications Due to Incorrect Conversion Factors in Three Gaseous Radiation Monitors | Waterford | 18 March 2022 | Non-Compliance with Technical Specifications Due to Incorrect Conversion Factors in Three Gaseous Radiation Monitors |
| 05000458/LER-2021-005, Potential Loss of Safety Function Due to Inoperable Reactor Core Isolation Cooling Steam Flow Transmitter | River Bend | 16 December 2021 | Potential Loss of Safety Function Due to Inoperable Reactor Core Isolation Cooling Steam Flow Transmitter |
| 05000458/LER-2021-004, Core Monitoring System Software Modeling Error Resulted in Conditions Prohibited by Technical Specifications | River Bend | 16 August 2021 | Core Monitoring System Software Modeling Error Resulted in Conditions Prohibited by Technical Specifications |
| 05000458/LER-2021-003, Condition Prohibited by Technical Specifications Due to Failure to Perform Breaker Functional Test | River Bend | 24 June 2021 | Condition Prohibited by Technical Specifications Due to Failure to Perform Breaker Functional Test |
| 05000458/LER-2021-002, Automatic Reactor Scram Due to Turbine Control System Communication Fault | River Bend | 28 May 2021 | Automatic Reactor Scram Due to Turbine Control System Communication Fault |
| 05000458/LER-2020-004, Inadvertent Initiation and Injection of High Pressure Core Spray (HPCS) | River Bend | 29 October 2020 | Inadvertent Initiation and Injection of High Pressure Core Spray (HPCS) |
| 05000458/LER-2020-002, Manual Reactor Scram Due to Reactor Recirculation Pump Trip | River Bend | 19 October 2020 | Manual Reactor Scram Due to Reactor Recirculation Pump Trip |
| 05000458/LER-2011-002, Re Operations Prohibited by Technical Specifications Due to Instrument Isolation Valve Mispositioning | River Bend | 14 April 2011 | Re Operations Prohibited by Technical Specifications Due to Instrument Isolation Valve Mispositioning |
| 05000458/LER-2011-001, Regarding Unplanned Actuation of Standby Service Water System Due to Procedure Inadequacy | River Bend | 21 March 2011 | Regarding Unplanned Actuation of Standby Service Water System Due to Procedure Inadequacy |
| 05000458/LER-2010-004, For River Bend Station - Unit 1 High Pressure Core Spray System Inoperable Due to Failed Motor Oil Reservoir Drain Plug | River Bend | 5 January 2011 | For River Bend Station - Unit 1 High Pressure Core Spray System Inoperable Due to Failed Motor Oil Reservoir Drain Plug |
| 05000458/LER-2010-003, Regarding High Pressure Core Spray System Declared Inoperable Due to Failure of Pump Room Cooler | River Bend | 19 August 2010 | Regarding High Pressure Core Spray System Declared Inoperable Due to Failure of Pump Room Cooler |
| 05000458/LER-2010-002, Unit 1, Standby Gas Treatment Filter Inoperable Due to Inadequate Surveillance Test Acceptance Criteria | River Bend | 1 July 2010 | Unit 1, Standby Gas Treatment Filter Inoperable Due to Inadequate Surveillance Test Acceptance Criteria |
| 05000458/LER-2010-001, Regarding Control Building Chiller Inoperable Greater than Allowable Outage Time | River Bend | 16 June 2010 | Regarding Control Building Chiller Inoperable Greater than Allowable Outage Time |
| 05000382/LER-2010-003, Regarding Worn Fuel Oil Line on a Train Emergency Diesel Generator Caused by Inadequate Mounting Clamp | Waterford | 20 May 2010 | Regarding Worn Fuel Oil Line on a Train Emergency Diesel Generator Caused by Inadequate Mounting Clamp |
| 05000382/LER-2010-002, For Waterford 3, Regarding Main Feedwater Isolation Valve B Exceeded Allowed Outage Time Due to Tubing Connection Failure | Waterford | 22 April 2010 | For Waterford 3, Regarding Main Feedwater Isolation Valve B Exceeded Allowed Outage Time Due to Tubing Connection Failure |
| 05000382/LER-2009-006, For Waterford 3, Regarding Degraded Hydraulic Fluid Causes Both Main Feedwater Isolation Valves to Fail Inservice Test Stroke | Waterford | 25 February 2010 | For Waterford 3, Regarding Degraded Hydraulic Fluid Causes Both Main Feedwater Isolation Valves to Fail Inservice Test Stroke |
| 05000382/LER-2009-005, For Waterford 3 Steam Electric Station, Unit 3, Regarding Spurious Moisture Separator Reheater Relief Valve Opening Resulting in a Manual Reactor Trip and an Engineering Safety Feature Actuation (Emergency Feedwater Actuation) | Waterford | 16 December 2009 | For Waterford 3 Steam Electric Station, Unit 3, Regarding Spurious Moisture Separator Reheater Relief Valve Opening Resulting in a Manual Reactor Trip and an Engineering Safety Feature Actuation (Emergency Feedwater Actuation) |
| 05000382/LER-2009-004, Regarding Condition Prohibited by Technical Specification with Log Power Channel Inoperable | Waterford | 11 December 2009 | Regarding Condition Prohibited by Technical Specification with Log Power Channel Inoperable |
| 05000458/LER-2009-003, Regarding Unit 1 Low Pressure Coolant Injection Actuation Following Loss of Water from Upper Reactor Cavity Pool | River Bend | 23 November 2009 | Regarding Unit 1 Low Pressure Coolant Injection Actuation Following Loss of Water from Upper Reactor Cavity Pool |
| 05000458/LER-2009-002, Regarding Unplanned Manual Reactor Scram Following Trip of Both Reactor Recirculation Pumps | River Bend | 17 November 2009 | Regarding Unplanned Manual Reactor Scram Following Trip of Both Reactor Recirculation Pumps |
| 05000382/LER-2009-003, Regarding Multiple Tyco Relay Failures | Waterford | 18 August 2009 | Regarding Multiple Tyco Relay Failures |
| 05000382/LER-2009-002, Regarding Voluntary Report: Shortened Service Life of Station Battery B Due to Manufacturing Impurities | Waterford | 29 July 2009 | Regarding Voluntary Report: Shortened Service Life of Station Battery B Due to Manufacturing Impurities |
| 05000382/LER-2009-001, Regarding 3.0.4 Violation: Mode Change with an Inoperable Emergency Feedwater Pump | Waterford | 27 April 2009 | Regarding 3.0.4 Violation: Mode Change with an Inoperable Emergency Feedwater Pump |
| 05000458/LER-2009-001, Standby Liquid Control System Inoperable Greater than Allowable Outage Time | River Bend | 11 March 2009 | Standby Liquid Control System Inoperable Greater than Allowable Outage Time |
| 05000382/LER-2008-004, Loose Intercell Connecting Bolts on 125 Vdc Station Battery | Waterford | 3 November 2008 | Loose Intercell Connecting Bolts on 125 Vdc Station Battery |
| 05000458/LER-2008-003, Unit 1 Re Reactor Pressure Trip Unit Inoperable Greater than Allowable Outage Time | River Bend | 26 August 2008 | Unit 1 Re Reactor Pressure Trip Unit Inoperable Greater than Allowable Outage Time |
| 05000382/LER-2008-002, Regarding Inoperable Steam Generator Narrow Range Level Channels | Waterford | 17 July 2008 | Regarding Inoperable Steam Generator Narrow Range Level Channels |
| 05000382/LER-2008-003, Regarding Movement of Fuel Assembly in Reactor Vessel with Fuel Handling Machine Inoperable | Waterford | 17 July 2008 | Regarding Movement of Fuel Assembly in Reactor Vessel with Fuel Handling Machine Inoperable |
| 05000458/LER-2008-002, Regarding Automatic Reactor Scram Due to Malfunction of Main Turbine Control System | River Bend | 2 May 2008 | Regarding Automatic Reactor Scram Due to Malfunction of Main Turbine Control System |
| 05000458/LER-2008-001, Regarding Automatic Actuation of Standby Service Water System Due to Inadequate Work Instructions | River Bend | 10 March 2008 | Regarding Automatic Actuation of Standby Service Water System Due to Inadequate Work Instructions |